I recently received an email from a reader asking to what the Length in the following chart referred.
Admittedly at first I was at a loss to answer his question. It refers to the height of the coil when using RG-174. Poor choice of a word on my part. Length should be replaced with height throughout the paper.
The following chart gives a list of coaxial line chokes for various ham bands.
Turns Diameter* Height* Coax type Band Coverage
13 8 3.25 RG-174 160 meters only
RG-58
RG-8x
9 9 3 RG-174 80 meters only
RG-58
RG-8x
8 6 2 RG-174 40 meters only
RG-58
RG-8x
9 4 2.25 RG-174 40 – 30 meters
RG-58
RG-8x
8 4 2 RG-174 30 – 20 meters
RG-58
RG-8x
5 5 2 RG-174 20 - 15 meters
RG-58
RG-8x
6 4 2 RG-174 17 - 10 meters
RG-58
RG-8x
4 3 1 RG-174 6 meters only
RG-58
RG-8x
* - Height and Diameter are in inches.
Thanks for pointing it out Tim.
Thirteen of RG-174 is 1.43 inches high. You will need to space the turns to achieve a coil height of 3.25 inches.
